Struct FileCoverage 

pub struct FileCoverage {
    pub path: String,
    pub statement_map: BTreeMap<String, Location>,
    pub fn_map: BTreeMap<String, FnEntry>,
    pub branch_map: BTreeMap<String, BranchEntry>,
    pub s: BTreeMap<String, u32>,
    pub f: BTreeMap<String, u32>,
    pub b: BTreeMap<String, Vec<u32>>,
    pub b_t: Option<BTreeMap<String, Vec<u32>>>,
    pub input_source_map: Option<Value>,
}

Coverage data for a single file. Serializes to Istanbul’s coverage-final.json format.

The root coverage-final.json is a map of file paths to FileCoverage objects.

Fields

path: String

Absolute file path.

statement_map: BTreeMap<String, Location>

Statement locations, keyed by sequential string IDs (“0”, “1”, …).

fn_map: BTreeMap<String, FnEntry>

Function metadata, keyed by sequential string IDs.

branch_map: BTreeMap<String, BranchEntry>

Branch metadata, keyed by sequential string IDs.

s: BTreeMap<String, u32>

Statement hit counts, keyed by the same IDs as statement_map. Istanbul allows null values (e.g., uninstrumented statements); these are coerced to 0.

f: BTreeMap<String, u32>

Function hit counts, keyed by the same IDs as fn_map. Istanbul allows null values; these are coerced to 0.

b: BTreeMap<String, Vec<u32>>

Branch hit counts, keyed by the same IDs as branch_map. Each value is a Vec with one count per branch arm. Istanbul allows null values in both the Vec and individual elements; these are coerced to 0.

b_t: Option<BTreeMap<String, Vec<u32>>>

Branch truthy tracking hit counts. Only present when report_logic is enabled. Tracks whether each operand in a logical expression evaluated to a truthy value. Keyed by the same IDs as binary-expr entries in branch_map.

input_source_map: Option<Value>

Input source map from a prior transformation (e.g., TypeScript → JS). Stored so downstream tools can chain back to the original source. Only present when InstrumentOptions::input_source_map was provided.

Implementations

impl FileCoverage

pub fn from_json(json: &str) -> Result<Self, Error>

Deserialize a FileCoverage from a JSON string.

Parses Istanbul-compatible coverage-final.json format. The input should be a single file’s coverage object (not the root map).

Trait Implementations

impl Clone for FileCoverage

fn clone(&self) -> FileCoverage

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FileCoverage

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FileCoverage

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for FileCoverage

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.